SU405575A1 - METHOD FOR PREPARATION OF IMPRESSED - Google Patents

Description

one

The invention relates to a method for the preparation of catalysts by the impregnation method.

A known method of preparation and impregnation of catalysts with adjustable thickness of the active layer is that the carrier granules are impregnated with a solution of catalytically active substance in an atmosphere of difficult and impregnated gases before impregnation of water with hydrogen. For example, the carrier can be treated with an air-ammonia mixture of different composition. The disadvantage of this method is its comparative complexity associated with the sparking of gas mixtures.

In order to simplify the technology of preparation of impregnated catalysts with adjustable thickness of the active layer, it was proposed to adjust the thickness of the active layer by: holding the catalyst after absorbing the proteitant pacTBOjpa on air for a certain time, different for different catalysts.

To prepare water-organic solutions of salts, it is advisable to take polar orthanic solvents.

Example 1. To prepare a 1% oxide-cobalt catalyst (cobalt concentration based on metal) with a propiite depth of 0.5 mm and a solution containing 1 ml of an aqueous solution of Co salt: (MOh) 3-6 HsO (concentration of co; Balta 0,101 g / ml), 1 ml of water and 2 ml of ethanol, pour 10 g of ball

α-alumina (diameter 1 ball 5 mm) with a humidity of 0.5% and the mixture is thoroughly mixed. The volume of the dropping solution is | db1I | dai equal to the alcohol-water absorption of the carrier. After the entire solution is absorbed, the catalyst is dried from moisture for 6-8 hours; at PO-130 ° C and then calcined for 1-3 hours at 300 ° C.

15

20

25

thirty

Pr. M er 2. To prepare a 0.5% Pd / AlaOs catalyst with an impregnation depth of 0.3 mm into a solution containing 2.14 ml of an aqueous solution of the complex salt N.a2PdCl4 (PdCl2 concentration 0.1 g1 ml), 7 , 86 ml of water and 10 ml of ethanol, 50 g of bead T-alumina (ball diameter 5 mm) with a humidity of 0.5% are added and the mixture is thoroughly mixed. After the entire solution is absorbed, the catalyst is kept in air for 1 hour, then dried at PO-130 ° C and heated at 300 ° C for 1 hour.

Data on the dependence of the depth of impregnation of j-oxide and aluminum granules with solutions of catalytically active substances on the times are given in the table.

Subject invention

The method of preparing impregnated catalysts with adjustable thickness of the active layer by impregnating the carrier with an aqueous organic solution of a catalytically active substance, followed by drying "calcining, is characterized in that, in order to simplify the process, the thickness of the active layer is controlled by keeping the catalyst in and absorbing the impregnating solution in air.